Abstract: An embroidery device includes a needle including a hole through which a thread has been passed, a dyeing unit configured to dye the thread in different colors, an embroidery unit configured to move the needle to perform a sewing process on a medium with the thread dyed in the different colors by the dyeing unit, and a remover configured to remove the linear member in a vicinity of the needle.

Abstract: An embroidery apparatus includes a main unit to be detachably mounted on a bed section of a sewing machine, a first translation mechanism that moves an embroidery frame holder with an embroidery frame mounted thereon in a first direction, a second translation mechanism that moves the first translation mechanism along an upper surface of the main unit in a second direction that orthogonally intersects the first direction, and an elevator mechanism that is supported by the second translation mechanism at opposite sides of the main unit and that raises and lowers the first translation mechanism. The embroidery apparatus is applicable to a sewing machine switchable between embroidery stitching and standard stitching. During standard stitching, the upper surface of the first translation mechanism is flush with the upper surface of the main unit, which enables both upper surfaces to be used as an auxiliary table.

Abstract: A positioning structure for a movable tongue seat includes: an eccentric positioning member disposed between the movable tongue seat and the cutter seat, the eccentric positioning member is provided with a rotary end which is located toward one end of the cutter seat, wherein the eccentric positioning member rotates about the rotary end and is further provided with a drive end which is inserted in a slot of the movable tongue seat, the drive end and the rotary end are not coaxially aligned; and a pivot hole and a pivot provided between the movable tongue seat and the cutter seat, so that the movable tongue seat is able rotate on the cutter seat by rotating about the pivot. When the eccentric positioning member rotates about the rotary end, the drive end can push the movable tongue seat to rotate about the pivot to a desired position.

Abstract: A sewing machine includes a horizontal hook that is held within an outer hook and an accommodating portion of the outer hook that includes a spiral-shaped columnar portion to which the thread loop captured by the hook point is wound. The sewing machine also includes a chain looper that guide the thread loop induced in spiral shape upward, and an inner hook for chain stitching that is supported by the outer hook that restricting upward movement of the thread loop drawn into the interior of the outer hook.

Abstract: A presser foot has a rod pin and is received by an engagement groove provided with a presser holder. By measuring the resistance value of the rod pin, the rod pin is identified. Terminals are provided with the engagement groove, which contact the rod pin for measuring the resistance. The terminals are connected to a circuit that connects to a circuit of a presser bar. A receiving groove is formed at the presser holder, an inserting part is formed at the lower end of the presser bar, and the presser holder is connected to the presser bar by setting the inserting part in the receiving groove and fixing it. The terminals and the circuit are provided with the inserting part connecting to the electrical resistance measuring apparatus where the resistance of the rod pin is measured, then determination apparatus identifies the rod pin and a display informs the result.

Abstract: An embroidery unit (30) attachable to a sewing machine bed (1) of a sewing machine (M) capable of executing a normal mode executing sewing operation while vertically moving a feed dog (13) provided in the sewing machine bed (1) and an embroidery mode executing sewing operation while maintaining the feed dog (13) below a needle plate (1b) and provided with an embroidery frame feed mechanism moving an embroidery frame (33) holding a workpiece cloth provided with a mode switch unit (35) for selectively switching the feed dog (13) between the normal mode and the embroidery mode with the embroidery unit attached to the sewing machine bed (1); and a selection switch unit (50) switching status of the mode switch unit to embroidery mode in synchronization with a removing operation when removing the embroidery unit from the sewing machine bed (1).

Abstract: A needle assembly for a tagger gun includes a needle carrier slidably disposed within the tagger gun casing, a needle removably mounted into a needle bore in the needle carrier, and a needle lock snap-mounted into a needle lock bore in the needle carrier. The needle lock includes a locking post having a first end and a second end, and an enlarged head formed onto the second end. The locking post is shaped to include a longitudinally-extending slot which bifurcates the first end into a pair of parallel fingers. A ratchet-shaped tooth is formed onto each finger, each tooth including a tapered surface for guiding the needle lock into needle lock bore and an engagement surface for retaining the needle lock mounted in the needle carrier. In use, the needle lock can be rotated about its longitudinal axis to selectively lock the needle in place within the needle bore.

Abstract: A system for converting an automatic embroidery machine from one type of work to another type of work is disclosed. The invention adapts a cap frame sash or driver unit or sash to be quickly mounted to and dismounted from a tubular frame sash or holder. The cap frame sash has additional braces so that the cap frame sash snaps into a tubular frame sash. The tubular frame sash has clips that engage the additional braces on the cap frame sash in a quick-release fashion. There is no need to remove the tubular frame sash from the machine to embroider caps. The flat work frame is simply snapped out of the clips of the tubular frame sash, and the cap frame driver or sash is snapped into the tubular frame sash. The invention uses spring clips, registration pins, and complementary sockets. No fasteners are required since a single type of sash is able to accommodate more than one type of workpiece frame when the embroidery machine is reconfigured.

Abstract: The sewing machine comprises two hooks 27a and 27b which are respectively disposed in such a manner as to correspond to two needles 7 and 7 provided in the present sewing machine, hook gap adjusting device 33-35 respectively for changing the gap between the two hooks 27a and 27b, drive device 36 for driving the hook gap adjusting device 33-35, transmission device 37-41 respectively for transmitting the driving of the drive device 36 to the hook gap adjusting device 33-35, and control device 50 for controlling the driving of the drive device 36 to thereby control the above gap between the two hooks, whereby the sewing machine is able to move the hooks 27a and 27b easily only by driving the drive device.

Abstract: A sewing machine with an embroidery stitching function is disclosed, wherein a needle is vertically reciprocated to form stitches on a work held by an embroidering frame (19) which is moved in X-Y directions by a frame moving device relative to the needle on a working surface (2a) of a working bed (2), the frame moving device being composed of composed of a first mechanism (A) for moving said embroidering frame in the Y direction and a second mechanism (B) for moving the embroidering frame in the X direction, the first mechanism (A) being located on the working surface and connected to the embroidering frame (19) and the second mechanism (B) being housed in the sewing machine, the first mechanism (A) being moved by the second mechanism (B) to one end of the working bed (2) where the first mechanism (A) is rotated to a retreated position at the time of carrying out the ordinary stitching operation.

Abstract: A overedge sewing machine comprises: drive mechanisms for selectively carrying out a hemstitch sewing operation and flat stitch and double-chain stitch sewing operations; a needle plate having a stitch finger, a guide needle piece and a stitch tongue reciprocatable between an operation position and a non-operation position outside the needle plate claw and guide needle; and three needles mounted removably thereon in such a manner that the three needles are arranged in parallel to each other substantially on a straight line, wherein a needle point which is used in common with the overedge sewing operation and the flat stitch and double-chain stitch sewing operations is positioned between the stitch tongue and the guide needle piece respectively provided in the needle plate.

Abstract: A holder for sewing machine bobbins containing thread which will be used with a serger. The holder has an aperture with a grommet therein that will fit the spindle on any brand of serger and will secure the holder on the serger. The holder also includes a plurality of spindles which will hold the sewing machine bobbins, and a cover with apertures through which the threads can be extended to connect to the serger.

Abstract: A bed portion, minutely speaking, a portion corresponding to a rise-and-fall position of a needle, of a lock stitching machine or an over-lock stitching machine is formed into a unit and combined with a machine proper in a mounting/detaching free state, and uses plural sewing units that are selectively exchanged for each other. The machine proper 1 is formed by cutting of a top portion of a bed 1" on the right of a needle plate portion, leaving the cut-off portion as a connecting surface 5. A sewing unit 2 or 3 is formed by providing a needle plate 12, feeding teeth 13, a shuttle drive mechanism 15, a cloth feed mechanism 19 or loopers 47 and 49 and their drive mechanism 48 and 58 in one unit body. Its right side is left as a connecting surface 20, and the two elements are combined as one body in a mounting/detaching free state through a shaft coupling 7, a fitting portion 10 and a combining means 11, respectively protruding on the abovementioned two connecting surface.

Abstract: A convertible sewing machine utilizes plain-seaming and closed-seaming head assemblies to provide both plain-seaming and closed-seaming functions in a single integral package. The convertible sewing machine includes a housing having opposing ends, a plain-seaming head-assembly disposed at one end of the housing, a closed-seaming head-assembly disposed at the other end of the housing, a drive motor and a drive-coupling assembly for mechanically coupling the drive motor and at least one of the plain-seaming and closed-seaming head-assemblies. The drive-coupling assembly is capable of selectively engaging either, or both of, the head-assemblies. A turntable mechanism can also be included for rotating the convertible sewing machine into several positions of operation.

Abstract: An overlock sewing machine which can readily form a rolled seam with no requirement for a complicated tension adjusting operation is disclosed. In this overlock sewing machine, an auxiliary thread tensioner (15) is provided independently of a main thread tensioner (4), providing a lower looper thread (9) with thread tension which is necessary for forming an over-edge chain stitch, in the vicinity thereof. An end cam (25) is provided on a shaft (13) of a dial (12) for feed adjustment, so that an upper pawl (23) rams one portion of the peripheral edge of a tension disc (20) and expands a side which is opposed thereto for canceling tension provision to the lower looper thread (9) passed through tension discs and provides the tension only by the main thread tensioner (4) to carry out an ordinary over-edge chain stitch when a lower pawl (24) is engaged with a high lift part of the end cam (25).

Abstract: A sewing machine including a head portion for mounting a needle with a needle thread; a needle drive motor for driving the needle; a bed portion; and a loop taker module detachably fixed to the bed portion and including: a loop taker for catching a thread loop of the needle thread of the needle; and a loop taker drive motor for driving the loop taker.

Abstract: An overlock sewing machine which can switch its operation from an ordinary over-edge chain stitch to a rolled seam or vice versa with no requirement for a complicated operation of adjusting thread tension is obtained. This overlock sewing machine is provided with a spring for providing a thread with prescribed tension. The overlock sewing machine is further provided with a switching mechanism for switching the thread tension between that for the rolled seam and that for the over-edge chain stitch by switching the spring between a tensioning state and a non-tensioning state. Thus, the thread tension is readily switched between that for the rolled seam and that for the over-edge chain stitch.

Abstract: A sewing machine includes two rods rotatably and slidably supported in the sewing machine and two lower loopers secured on the rods. A spindle is coupled to the rods by an eccentric and coupling members for rotating the rods and the lower loopers. One of the lower loopers may be moved axially together with one rod to which a pawl is rotatably supported, The pawl may be selectively engaging with the other rod for allowing the pawl to selectively moving the other rod axially and for allowing the lower loopers to perform two double chain stitchings.

Abstract: In a looper switching mechanism for an overlock sewing machine, a needle having a needle thread and movable vertically, is provided. A right looper having a thread hole at a tip end through which a right looper thread is inserted, includes a mounting hole into which a shaft portion of a spreader member body is attached. A hook portion having a tip end engageable with the thread hole is coupled to and extends from the spreader member body thereby forming the a spreader.

Abstract: A jump foot kit assembly for a sewing machine. As such, the invention is particularly useful in providing jump foot capabilities to sewing machines which were not configured by the manufacturer to have jump foot capabilities. In one embodiment, the jump foot kit assembly includes a housing which is detachably interconnectable with the sewing machine. The housing includes a bore extending through at least a lower portion of the housing such that a jump foot bar may be movably received therein. A jump foot is preferably detachably connected to a lower portion of the jump foot bar and an appropriate linkage assembly may operatively interconnect the sewing needle drive assembly and the jump foot bar to move the jump foot into and out of engagement with stitchable material being sewn upon by the sewing needle in timed relation with the sewing needle.

Abstract: A shuttle hook driving device for driving a shuttle hook having a beak disposed between a needle drop position and a bobbin thread lead-out point of a bobbin in a sewing machine which includes a main shaft, a needle bar, a thread take-up lever, and a conversion mechanism for converting a rotation of the main shaft into an oscillating motion, the shuttle hook driving device comprises: a counter balance connected to the needle bar and the thread take-up lever, the counter balance being mounted on the main shaft such that the counter balance is displaced a predetermined angle with respect to the main shaft as compared with a standard sewing machine; an output shaft received the oscillating motion from the conversion mechanism, the output shaft being connected to the conversion device in right-left inverted relation with respect to an axis thereof as compared with the standard sewing machine, using an uppermost point of the needle bar as a reference; and a driver connected to the output shaft, for driving the shu

Abstract: A rolled hem switching device comprises a lower knife mounting base which is arranged below a throat plate and is adjustably movable in a lateral direction by way of a laterally moving mechanism provided on a sewing machine frame, a moving pawl which slidably engages a guide groove extending in a cloth feeding direction on a side surface of the lower knife mounting base, a presser member which is fixed to the lower knife mounting base and slidably supports a side surface of the moving pawl and which comprises a horizontal slit of a given length for projecting a projecting portion of the moving pawl therethrough and a lower knife which is fixed to a side surface of the lower knife mounting base at a front side of the presser member for slidably supporting a side surface of the moving pawl.

Abstract: A sewing machine is comprised of a bed, an arm having a vertical portion set upright on the bed, and a horizontal portion horizontally extending from the upper end of the vertical portion, an arm shaft extended within and journaled on the arm, a sewing head detachably joined to the extremity of the arm, a needle bar incorporated into the sewing head, supported so as to be driven for vertical reciprocation on the sewing head by the arm shaft, and capable of being removed from the arm together with the sewing head, a motion converting means detachably connected with the needle bar to convert the rotation of the arm shaft into the reciprocation of the needle bar, a needle thread feed device disposed on the sewing head to feed a needle thread to a needle attached to the lower end of the needle bar, and a thread takeup device disposed on the arm and capable of operating in synchronism with the vertical reciprocation of the needle bar to draw up the slack needle thread and of releasing the needle thread.

Abstract: A sewing device (13) consists of a basic unit (13) comprising the main motor, the needle bar (27), and the take-up lever (31), and a shuttle block (24) detachably mounted thereto which comprises the shuttle (35) with the thread bobbin (36) for the lower thread. For changing an empty thread bobbin, the sewing machine mounted to a robot arm is inserted into a reception unit (21) in which the shuttle block (24) remains, whereas the basic unit (23) is moved to another shuttle block with full thread bobbin (36a) and receives it. The sewing machine does not require a time-consuming manual change of the thread bobbin for the lower thread.

Abstract: For conversion of stitch mode from one stitch shape to the other stitch shape without interference with one another, a safety device for a sewing machine, as a safeguard against malfunction of the machine when conversion is made, is equipped with a stitch forming signal generator means for associating a signal with a stitch mode, a mounting-demounting signal generator means for associating a signal with table displacement, and a circuit for rendering a motor inactive irrespective of operation of a controller for the motor.

Abstract: There is provided a needle attachment position indicator device for use in a sewing machine of a type comprising a stitch pattern forming mechanism provided in a machine frame for permitting selection of one stitch pattern from a plurality of different stitch patterns, an actuator member disposed in the machine frame for permitting selection of the stitch pattern, an actuation mechanism disposed in the machine frame for setting the stitch pattern forming mechanism at selected stitch pattern in response to the selective actuation of the actuator member, and needle holding means having a plurality of needle attachment positions. The device includes an indicator member capable of indicating needle attachment position corresponding to the selected stitch pattern, in response to the selective actuation of the actuator member.

Abstract: An overcast sewing machine in which a plurality of different stitch types can be sewn.Various designs are disclosed for sewing alternatingly the stitch types 512 and 514, which consist of two needle threads, one lower looper thread and one overcast looper thread. In one design, the holder of the overcast looper can be fixed in a first working position, in which both needle threads are interlinked with the overcast looper thread, and can be displaced into a second working position, in which only one needle thread is interlinked with the overcast looper thread. According to another design, two thread eyes are provided in the overcast looper and the overcast looper thread is threaded through one of these thread eyes to form one of the stitch types and through the other thread eye to form the other stitch type. In addition, stitch type 504, consisting of three threads, can be formed by removing one needle.

Abstract: An overlock sewing machine is provided with means for driving a lower looper according to a plurality of different oscillational movements independently of each other, a clutch mechanism for changing the aforementioned movements from one to the other mode, a back and forth drive mechanism for moving a lower looper back and forth, a mechanism for transmitting movement of the back and forth drive mechanism to a lower looper and releasing transmission of the movement therefrom, a lower looper oscillating means for oscillatively moving a lower looper, a mechanism for releasing oscillational movement of the upper looper therefrom, and a motion change-over device for interchanging operation between the clutch mechanism, the transmission and release means, and oscillational movement release means. The arrangement permits conversion of various stitch formations in a sewing machine to take place in a simple manner without requiring complicated adjustment.

Abstract: A top feed unit comprises a vertical-movement kinematic mechanism (19) and a horizontal-movement kinematic mechanism (20) acting on a rocking arm (18) supporting a top feed dog (17) and operated by respective eccentrics (21, 29) fitted to an auxiliary shaft (37). The vertical- and horizontal-movement kinematic mechanisms (29, 20) and the auxiliary shaft (37) are contained in a housing structure (34) which can be detachably engaged to the sewing machine head (7). The auxiliary shaft (37) is connected to an interconnecting stem (41) rotatably connected to the sewing machine arm (6) and driven in rotation, through a toothed belt (46), by the upper drive shaft (8) of the sewing machine (2).

Abstract: An overlock sewing machine which is arranged such that a lower thread take-up lever is disposed independently of an upper looper thread take-up lever and that a lower looper thread take-up lever drive mechanism is fabricated independently of an upper thread take-up lever drive mechanism and adapted to connect thereto an adjust means for adjusting the amount of thread fed from the lower looper thread take-up lever.

Abstract: A stitching mode changer for an overlock machine which enables stitching modes, i.e., ordinary overlock stitching, standard roll hemming, and special roll hemming, to be changed by a one-touch control operation and which is free from danger of an accident, e.g., breakage of a looper, due to erroneous operation. When a fabric feed dial is set to a feed rate for the ordinary overlock stitching, an adjusting member is flush with a needle plate, but, when the fabric feed dial is adjusted to a feed rate for the standard roll hemming, a cam that is secured to the dial rotates, so that a lever that abuts on the cam surface of the cam pivots, causing the adjusting member engaged with the lever to withdraw below the needle plate. The advance and withdrawal of the adjusting member are reliably effected by a combination of a spring and a retainer for guide, which are provided on a lower knife mount that supports the adjusting member.

Abstract: An attachment for a looper is provided whereby one looper of a three (3) or more thread serger can be converted into a spreader for use during stitch formation. The attachment comprises a resilient band which can be quickly positioned over the throat of a looper and a longitudinal member which is pivotally attached to the band for convenient placement through the looper eyelet and which can be likewise easily manually removed without the use of tools.

Abstract: A switching device is provided for a sewing machine for switching operation of the sewing machine from a zigzag stitching to embroidering or vice versa. The switching device comprises a rotatable disc fixedly mounted on an output shaft of a stepping motor and a sliding member that movably connects one end of a transmission rod via a pin, the other end of which is connected to a needle bar supporter or a fabric feed device, with the rotatable disc so that the one end of the transmission rod is movable between a first position on the rotatable disc which coincides with the center of rotation of the rotatable disc, and a second position on the rotatable disc which is spaced apart from the center of rotation of the rotatable disc.

Abstract: A device for switching between normal and embroidering stitching comprises X-directional and Y-directional drive control devices for controlling movement of the embroidering stitching device in X- and Y-directions, respectively, and two stepping motors for driving a needle bar control device or the X-directional drive control device, and a feed control device or the Y-directional drive control device, respectively. Two switching elements alternatively connect the first stepping motor with either of the needle bar control device or the X-directional drive control device, and the second stepping motor with either of the feed control device or the Y-directional drive control device, respectively, to provide for normal and embroidering stitchings, respectively.

Abstract: There is disclosed an overlock sewing machine. The overlock sewing machine includes a looper switching unit for selecting an overlocking operative state or overlocking inoperative state, a needle clamp member having a first needle holding hole in which two needles are mounted separately in the manner that the two needles are positioned in parallel and a second needle holding hole positioned slightly eccentrically at the front side of the cloth feeding direction and perpendicular to the cloth feeding direction, whereby eight types of overlocking operations and one type of double-loop stitching operation can be effected.

Abstract: A composite sewing machine has a lock stitch mechanism and an over-lock stitch mechanism. A switching mechanism is connected to the stitching mechanisms for switching the operation of the sewing machine between a lock stitch operation and an over-lock stitch operation. The machine has a single needle carrying element, a needle position converter for changing the position of the needle carrying element laterally of the stitching direction and including a needle bar connecting stud engaging the needle carrying element and a fulcrum shaft on which the stud is rotatably mounted for pivotal movement to change the vertical orientation of the needle carrying element between a lock stitch position and an over-lock stitch position which are adjacent to each other and juxtaposed laterally on the sewing machine.

Abstract: A sewing machine comprises a bed 3 on which a work-supporting table 3a is defined and from which a post 4 carrying a cantilevered support arm 5 provided with a needle-holding head 6 at its free end, rises up. An upper shaft 9 performing a rotating motion is housed within the arm 5 and it imparts a reciprocating movement, through a connecting rod-crank linkage 10, to a needle bar 11 vertically slidable in the head 6. Along the upper shaft 9 a plurality of eccentrics 19, 20, 21 are distributed to which auxiliary sewing operation devices 22, 32, 39 detachably associated with the sewing machine 1 are operativley engageable through respective connecting rods 23, 33, 50 and transferring motion mechanisms. A preformed opening 5 is formed in the support arm 5, through which connecting rod 50 is mounted to eccentric 21. An opening 36 is formed in support arm 5 through which stem 37 passes.

Abstract: A looper for a sewing machine capable of making overlocked stitches has a unitary distal portion which is operable for the selective production of overlocked stitches with one needle and three threads or one needle and two threads. The unitary distal portion of the looper includes an upper looper portion and a spreader portion. A holder is provided in connection with driving means for supporting the looper, and a positioning arrangement is provided to selectively position the unitary distal portion of the looper in a first position for movement along a first path or in a second position for movement along a second path for the selective production of the stitches.

Abstract: In a sewing machine having two mechanisms different in sewing functions installed within one machine frame a single drive motor is provided and functions are alternately actuated by means of a clutch mechanism. Transmission of a driving force is made by keys and corresponding key grooves, and a selection mechanism has a switch-checking device for avoiding an erroneous operation. A release device of the switch-checking device is actuated by operation of the flywheel, to avoid dangers of erroneous switching during operation.

Abstract: An overedge sewing machine is adapted to perform three thread overedge stitching (STITCH TYPES 504 and 505) under the cooperating action of one needle (6) and an upper looper (15) and a lower looper (31). In addition to swing movement in the direction crossing the fabric feed direction, reciprocating movement in the fabric feed direction is selectively applied to the lower looper, whereby the front end of the lower looper is revolved around the needle. If the lower looper is revolved around the needle with the upper looper out of action, this operation provides double chain stitching (STITCH TYPE 401). Further, if the lower looper is revolved around the needle with the upper looper in action, this operation provides three thread double chain overedge stitching (STITCH TYPE 601).

Abstract: A housing forming the free bed base in a sewing machine which is detachable from the remainder of the machine and which is comprised of a tray-shaped base module on which are mounted all lower sewing members that cooperate with the needle in the formation of stitches. These members include a needle plate, closing flat plates located alongside the opposite edges of the needle plate and closing interchangeable elements defining both the front and rear walls of the housing and the remaining portion of the upper flat surface of the latter which is not covered by the closing flat plates and the needle plate.

Abstract: A sewing machine consisting of left and right hand individual sewing machines which are joined together adjustably to provide a gap between the machine bases in which drive means are provided that includes an external drive shaft that is joined at its ends to each of the individual machines.

Abstract: A sewing machine having a base constructed of two modules having coupling means permitting one of said modules to be quickly removed from the other so that different sewing instrumentalities can be substituted to alter the type of stitch being made.

Abstract: An improved modular sewing machine which has a base unit including a lower horizontal unit and a vertical upright unit to which can be attached demountable upper and lower stitching instrumentalities, the mounting surfaces of the stitching instrumentalities being substantially coplanar.

Abstract: In a double-function sewing machine including a lock stitch mechanism and an overlock switch mechanism, a stitching portion of an overlock stitch mechanism thereof is positioned at the right side of the machine frame as seen from a machine operator and at a front side with respect to a lock stitching free arm of the lock stitch mechanism. A space is provided between the rear end of the needle plate for the overlock stitch mechanism and the front face of the free arm, through which a fabric to be stitched passes.

Abstract: A chain stitch insert receivable in the bobbin case of a sewing machine is formed with a topside ledge which captures and consumes thread as a hook point carries a loop of thread around the bobbin case. The ledge enables the formation of chain stitches without the need for a special eyelet on the machine.

Abstract: In a double-function sewing machine including a lock stitching mechanism and an overlock stitching mechanism a common driving source and a common flywheel for both stitching mechanisms are used. A switching device for switching the sewing machine from operation with the overlock stitching mechanism to the operation with lock stitching mechanism and vice versa is provided in the sewing machine. This device includes a belt wheel bush rotatable with respect to the machine frame and driven by the driving source and secured to the shaft of the flywheel, a belt wheel for overlock stitching rotatably supported with respect to the machine frame and connected to the overlock stitch forming mechanism, a ratchet guide member mounted on the main shaft of the lock stitch-forming mechanism and pivoted with respect to the machine frame, two sliding plates one of which is the mounted on ratchet guide member and another one of which is mounted on the belt wheel, and a switching lever.

Abstract: A selecting device for a double-function sewing machine having a single drive motor with the sewing machine including a first stitch forming mechanism to produce one type of stitch, a second stitch forming mechanism to produce another type of stitch, and a transmission for transmitting the rotation of the drive motor to the first and second stitch forming mechanism. The selecting device includes a first clutch operated into an operative position to contact the first stitch forming mechanism to a transmission and operated into an inoperative position to disconnect that mechanism from the transmission, and a second clutch operated into an operative position to connect the second stitch forming mechanism to the transmission and operated into an inoperative position to disconnect that mechanism from the transmission.

Abstract: A straight stitch throat plate for a sewing machine is formed as a resilient thin sheet metal part with integral appendages including a depending rear tab which hooks under the edge of a feed dog slot in a zig-zag plate, laterally spaced depending tabs which are received in locator holes in the zig-zag place, and a bent down flange to extend over a front edge of the zig-zag plate into a position wherein the flange may be engaged by a slide plate on the sewing machine.

Abstract: A sewing machine has a stitch control pulse motor for changing the needle position and is connected to a needle plate by means of an intermediate control device which is operated by a starting device of the machine, to change the needle dropping hole.